Adjustable chair



Aug. 27 1929. A. STOLL ADJUSTABLE 01mm Filed March 4, 192"! Patented Aug. 27, 1929.

UNITED STATES ALBERT STOLL, F KOBLENZ, SWITZERLAND.

ADJUSTABLE 01mm.

Application filed March 4, 1927, Serial No. 172,859, and in Germany March 18, 1926.

The subject matter of the present invention is an adjustable stool, chair and the like, the seat of which is supported by a stem provided with notches with which a locking member cooperates, the latter being mounted on a guide casing for the stem carried by the pedestal. According to the present invention the guide casing is rotatably mounted in a guide ring fixed to the m pedestal and the locking member is constructed as a lever operable by the pressure of the foot.

Besides the known advantages inherent to the adjustment of the height of the seat this chair presents moreover the advantages of a revolving chair. The fact that the locking member is constructed as a lever operable by the pressure of the foot permits a very convenient and quick adjustment of the stool inasmuch as both hands are free for lifting or lowering the seat.

The turnable arrangement of the guide casing on which the locking lever is mounted presents the advantage that this locking lever may be quickly and readily found by turning the seat and may thereby be brought into the convenient position necessary for adjustment.

Two constructional examples of the subject matter of the present invention are illustrated on the accompanying drawings, in which:

Fig. 1 shows in a longitudinal section an adjustable stool having a locking lever arranged in the pedestal;

Fig. 2 shows in a longitudinal section an adjustable stool of a similar type in which the casing carrying the locking lever and the stem of the seat is mounted through the intermediary of springs in the pedestal;

Fig. 3 shows in a side view and in a horizontal section respectively the casing carrying the locking lever and serving as guidance for the stem;

15 Fig. 4 shows in a side View and front view respectively the locking lever;

Fig. 5 shows in side view and end view respectively the spring adapted to urge the locking lever into the locking position and Fig. 6 is a cross-section of the stem.

The pedestal comprises the feet 1 the upper ends of which are screwed to the upper guide ring 2 and the lower guide ring 3 forms the further means for connecting the feet together. In the lower guide ring 3 the casing or sleeve 4 is mounted and provided at its upper end with a supporting flange 5. In the lower part of the sleeve 4 cars; 6 are provided in which a pin 7 is horizontally mounted. The locking lever 8 is turnable about the pin 7 and projects with its nose 9 into one of the notches 11 of the stem 10 of the seat. The nose 9 passes thereby through the opening 12 of the sleeve 4. A spring 13 is mounted on the pin 7 and the hook shaped ends 14 of the spring project into the slots 15 of the sleeve 4 so that the windings of the spring 13 press against the lever 8 and maintain the nose 9 in the locking position. In order to cause the notches 11 to remain in the position opposite the nose 9 and to prevent a turning motion of the stem 10 relatively to the sleeve 4 the stem is provided with a groove 17 "into which a set screw 16 fixed in the sleeve 4 7 projects. As the sleeve 4 rests only loosely with its flange on the lower guide ring its turning is not restricted so that the stem and the seat may turn together with the sleeve and the stool or chair serves as a re volving chair. It the stool is not to be a revolving one the flange 5 may be fixed to the lower guide ring 3. The connection between the flange 5 and the guide ring 3 may also be temporarily efieoted, for in- 5 stance by means of a pin thrust through both members.

As is shown in Fig. 2 the sleeve 18 may be lengthened in the upward direction beyond the guide ring 8 whereby the flange 19 of the sleeve does not rest on the guide ring 8. In this case a coil spring 20 may be inserted between the flange 19 and the guide ring 3 so that the flange 19 rests on the spring and the sleeve 18 together with the shaft 10 and the seat of the stool is resiliently supported. In order to prevent the spring 20 from grinding on the guide ring 3 and from hindering the turning motion of the sleeve 18 a washer ring 21 is loosely inserted between the spring 20 and the guide ring 3.

I claim:

1. An adjustable stool, comprising in combination, a seat, a stem for supporting said seat and provided with notches a pedestal, an upper guide ring rigidly fixed to said pedestal, a lower guide ring fixed to said pedestal, a sleeve loosely surrounding said stem for guiding the latter and being turnable in said lower guide ring, means to prevent rotation of said sleeve relatively to said stem, a flange provided on said sleeve supporting the latter, and a locking member mounted on said sleeve and adapted to cooperate with the notches of said stem for locking the latter in the adjusted heights said locking member being adapted to be actuated by foot. I

2. An adjustable stool, comprising in combination, a seat, a stem for supporting said seat and provided with notches, a pedestal, an upper guide ring fixed to said pedestal, alower guide ring rigidly fixed to said pedestal, a sleeve loosely surrounding said stem for guiding the latter and beingturnable in said lower guide ring, means to prevent rotation of the sleeve relatively to said stem, a flange provided on said sleeve, a coil spring interposed between said flange and said lower guide ring and resiliently supporting said stem and said seat onsaid lower guide ring, and a locking member mounted on said sleeve and adapted to cooperate with the notchesof said stem for locking the latter in the adjusted heights, said locking member being adapted to be actuated by foot.

,3. In an adjustable swivel stool, the combination with a stem, a seat on the upper end of the stem, a pedestal, an upper guide ring rigidly secured to the pedestal and a lower guide ring rigidly secured to the pedestal; of a sleeve surrounding the stem rotatable, and slidable through the lower ring and having a flange, a seat loose on said sleeve and lower ring, a spring between the flange and seat, means carried by the sleeve and cooperating with the stem to permit the stem to be vertically adjusted in the sleeve, and means to prevent rotation of the stem with respect to the sleeve.

4:- In an adjustable swivel stool, the combination with a stem having notches therein, a seat on the upper end of the stem, a pedestal, an upper guide ring rigidly secured to the pedestal and a lower guide ring rigidly vsecured to the pedestal; of a sleeve loosely surrounding the stem and rotatable in the lower guide ring, said-sleeve having a supporting flange at its upper end, said sleeve having a hole through the side thereof and a pair of substantially parallel ears projecting therefrom, a spring-urged foot-operated locking lever pivotally mounted in said ears and having a nose arranged to pass through said hole and engage in a notch in the stem, i

and means to prevent relative rotation of stem and sleeve.

In testimony whereof, I have signed my name to this specification.

ALBERT STOLL. 

